> There might be other cases of legal direct change of system catalog 
> entries, e,g. varchar to text, if they all are only names for internally 
> identical data structures. Can you tell which datatypes may be legally 
> interchanged?

If pg_cast.castfunc is 0, you should might be able to do a datatype
change safely.

http://candle.pha.pa.us/main/writings/pgsql/sgml/catalog-pg-cast.html#AEN49071

-- 
Rod Taylor <[EMAIL PROTECTED]>

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